Reaction of CpCo(PPh₃)₂ with diphenylphosphinoalkynes: Syntheses and X-ray structures of 1,3-cyclobutadiene-substituted CpCoCb diphosphine and 2,5-cobaltacyclopentadiene diphosph

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• 作者：Chin-Pei Chang ; Roman G. Kultyshev ; Fung-E Hong
• 关键词：Dppf ; Cobalt-containing phosphine ; Suzuki coupling reaction ; Diphenylphosphinoalkynes ; Cobaltacyclopentadiene ; (η ; ⁵-Cyclopentadienyl)-(η ; ⁴-cyclobutadiene)cobalt
• 刊名：Journal of Organometallic Chemistry
• 出版年：2006
• 期刊代码：64_0022328x
• 类别：ch
• 出版时间：15 December 2006
• 卷：691
• 期：26
• 页码：5831-5837
• 文件大小：390 K

摘要

A potentially bidentate cobalt-containing phosphine ligand, [(η⁵-C₅H₅)Co(η⁴-1,3-(PPh₂)₂C₄Ph₂)] (trans-1), was prepared from the reaction between PhCCPPh₂ and CpCo(PPh₃)₂ obtained in situ from CoCl(PPh₃)₃ and NaCp. The cobaltacycle [(η⁵-C₅H₅)(PPh₃)Co(2,5-(PPh₂)₂C₄H₂)] (2) was prepared from the reaction of CpCo(PPh₃)₂ with HCCPPh₂. An oxidized product [(η⁵-C₅H₅)(PPh₃)Co(2,5-(P(O)Ph₂)₂C₄H₂)] (4), was obtained upon the attempted isolation of 2 using CTLC. Both 2 and 4 failed to produce [(η⁵-C₅H₅)Co(η⁴-1,2-(PPh₂)₂C₄H₂)] or its oxidized analog, respectively, upon thermal activation. The performance of phosphine 1 in the Suzuki coupling of several aryl chlorides with phenylboronic acid in the presence of Pd(OAc)₂ was evaluated.